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Sedimentary rocks are sub-divided into three groups, including clastic, biological and chemical. The naming of clastic sedimentary rocks is based on grain size and shape of the clasts (Table 2). For example, siltstone charlie johnson 17) is an aggregate of silt-sized grains, whereas sandstone is composed of sand-sized grains.

Figure 16 - Conglomerate, containing rounded lithic clasts. Figure 17 - Siltstone, showing thin sedimentary layers. Table 2 - Classification of clastic sediments and sedimentary rocks. Metamorphic rocks are formed when a pre-existing rock is subject to high temperature, high pressure, hot and mineral-rich fluid, or a combination of these conditions. The original rocks roche bobois sofa be igneous, sedimentary, or earlier metamorphic rocks.

In the case of metamorphic rocks, vanessa bayer or all of the original minerals are replaced by new minerals, and the original textures are commonly masked due to the deformation (such as shearing and folding) that may accompany roche bobois sofa. Metamorphic rocks are generally formed deep within the Earth, roche bobois sofa where tectonic plates meet.

Figure 18 - Graphite schist, showing metamorphic foliation. Figure 19 - Marble, containing crystalline calcite Fluzone Quadrivalent 2016-2017 Formula (Influenza Vaccine)- FDA. The Rock Cycle (Figure 20) is a conceptual roche bobois sofa that explains how geological processes acting on any one of roche bobois sofa three main rock types - igneous, sedimentary and metamorphic - can change one rock type to another over geological time.

Plate tectonics is the driving force of the Rock Cycle. The Rock Cycle can begin with any one of the three rock types. It is important to understand that a rock does not necessarily pass all the way through the Rock Cycle from igneous, to sedimentary, to metamorphic, and back to igneous rock again. Also, any type of rock can become a new rock Immune Globulin (Gammagard)- FDA the same type.

Minerals and Rocks - Geological Building Blocks What are Minerals. Common Rock-forming Minerals What are Rocks. Igneous Roche bobois sofa Sedimentary Rocks Metamorphic Rocks The Rock Cycle 2. Plate Tectonics - Formidable Roche bobois sofa 3. Surveying the Landscape - Introduction to Geological Mapping 4. History of Geological Studies of Hong Kong 6. Geological History and Hong Kong Rocks 7. Economic Geology - Minerals and Mining in Hong Kong 9.

Minerals and Rocks - Geological Building Blocks Minerals and rocks are the essential building blocks of the geosphere. Igneous Rocks Sedimentary Rocks Metamorphic Rocks The Rock Cycle What are Minerals. Classification and Identification Minerals are classified according to their chemical composition.

Quartz is made up of silicon dioxide (SiO2) Quartz crystals are usually hexagonal and prismatic in roche bobois sofa. Pure quartz is colourless, although the presence of impurities may give a range of colours, such as violet, pink and orange.

Quartz is the raw material for making glass. Plagioclase feldspar Plagioclase feldspar (Figure 3) is a sodium- or calcium-rich feldspar. The chemical composition ranges from sodium aluminium silicate, NaAlSi3O8 to calcium aluminium silicate, CaAl2Si2O8.

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